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The small punch test technique (SPT) was used to evaluate the mechanical properties of various materials and the basic method to test material tensile mechanics performance from an inverse finite element (FE) arithmetic with SPT was put forward. The research shows that specific tensile mechanical behavior and strain-stress distribution of each district of weld seam can be accurately determined by small punch test. Therefore, mechanical behavior of the inhomogeneous joint can be predicted by a numerical model. The simulation comes to good agreement with experimental data.